I029 N over 271 St - County Rd 106
Lincoln County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I029 N over 271 St - County Rd 106 in Lincoln County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2005, making it 20 years old at the 2025 inventory.
- It carries about 23,640 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 74 of the 207 inventoried bridges in Lincoln County rated good (35.7%); 32 (15.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated November 2023, on a 48-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (43.46125, -96.79733)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 208 ft |
| Location | 2.1 S I229 Interchange |
| NBI structure number | 000000042065030 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2023 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Lincoln County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I029 over Nine Mile Ck | 1958 | 33,530 | Good |
| I029 S over I229 S & I029 S Off Ramp | 2016 | 29,860 | Good |
| I029 N over I229 S & I029 S Off Ramp | 2016 | 29,860 | Good |
| S Louise Ave over I229 | 1993 | 24,586 | Fair |
| I029 S over 271 St - County Rd 106 | 2005 | 23,640 | Fair |
| Western Avenue over Creek | 2004 | 17,900 | Good |
All bridges nearby: Lincoln County, SD bridge conditions · every bridge in Lincoln County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.